Pinking shears



Nov. 10, 1953 E. KANE El AL 2,658,274

PINKING SHEARS Filed Dec. 29, 1950 FIG. I.

' INVENTORS. EDWAI? KANE nub L, TLOCK FIG.4. BY L 3 A T TOR/W 75.

Patented Nov. 10, 1953 UNITED STATES PATENT OFFICE 2,658,274 PINKiNG siiEAR i Edward "Kane and Edwin L. Whitlock, New York, N. Y. Application December 29, issaiseriai'5101203476 Our invention relates to a new and improved pinking shears.

According to our invention, pinking shears can be quickly and easily manufactured at very low cost.

Other objects and features and advantages of our invention are stated in the annexed description and drawings which illustrate a preferred embodiment thereof.

In the drawings:

Fig. 1 is a perspective view showing, from top to bottom, the punch which is used in the process; a. strip of corrugated steel which is an element of each blade of the pinking shears; one of the base members or shank members of the shears; and the die in which the steel strip and the base member are assembled;

Fig. 2 is a longitudinal section, partially in elevation, which shows the assembly of the corrugated steel strip with one of the shanks of the shears and also shows the punch in upper and non-operating position;

Fig. 3 is the same as Fig. 2, showing how the punch has been depressed under pressure in order to make the desired assembly;

Fig. 4 is a top plan view of the finished shears; and

Fig. 5 is an enlarged transverse cross-section of the shears in closed position.

The body of the improved shears consists of identical longitudinal body members I and 2 which have respective shanks la and 20..

These body members I and 2 are preferably made of aluminum or aluminum alloy or other metal or alloy which is more yieldable under cold pressure at 20 C.-25 C. than hardened steel. Said metal or alloy of the body members I and 2 is easily extrudible.

These body members I and 2 are made by die casting or other suitable means so that their inher or'adjacent lateral surfaces are pre-shaped to provide transverse corrugations or ribs 3 which are separated by intermediate transverse recesses 4. Said pre-shaped surface refers to said lateral faces, before said body members I and 2 are assembled with strips S.

Fig. 1 shows a strip of steel S which is transversely corrugated by an ordinary stamping process with ordinary stamping dies, so as to provide transverse ribs or corrugations 5 and 5a and transverse recesses 6. This strip S is also provided with any suitable number of holes 1 extending vertically through the strip. This shape of strip S is designated as its pre-shape.

The strip of steel S can be transversely stamped 1 Claim. (Cl. 30-230) or corrugated into the pro-shape shown in Fig. l and said strip S can then be tempered or hardened in order to provide it with the necessary cutting or shearing properties.

"respective transversely corrugated and preshaped corrugate'd'strip S is assembled with each shank I a and 2a of the body members I and 2, the process being identical.

' For example, and as shown in Fig. 2, the longitudinal shank la is located to abut the longitudinal bottom wall 8 of a channel-shaped die D, which has planar parallel and longitudinalwalls sand 9a which are perpendicular to the longitudinal planar bottom wall 8. The die D may be closed at its left end by transverse end-wall.

The shank la fits closely in said die D.

The respective corrugated strip S is then placed upon the top of the lateral transversely ribbed or corrugated face shank la. The strip S interfits closely with the ribbed top surface of the shank Ia. While this fit should be as close as possible, there are necessarily some irregularities.

The punch P is then moved downwardly by means of an hydraulic press or other suitable means. This punch P has a bottom surface which is provided with transverse ribs or ridges 10 with intermediate transverse recesses l I. This bottom ribbed surface of the punch P interfits with the corrugated strip S.

Upon suitable pressure being applied by punch P, which may be applied at ordinary room temperature of 20 C. to 25 C., the transverse strip S is forced firmly transversely into very close interfitting relationship with the transversely ribbed face of the'shank la. Some surface material of the shank la will be extruded and forced upwardly into the holes 7 of strips S, thus forming aluminum studs or pins l2 which are integral with the shank la, and which maintain a firm grip upon the strip S, thus anchoring the strip S in position. The pressure does not substantially distort member l or 2 from its original shape, save to form said studs or pins l2 by extrusion, and to produce a close interfit between the respective strip S and the respective shank la. or 2a.

Optionally, the top transversely corrugated surface of the shank la may be initially provided with upstanding integral studs which partially enter the holes 7 when the parts S and I a are assembled and these initial studs are enlarged by the aforesaid extrusion under pressure, thus producing the final rigid and permanent assembly.

The same assembly is made with another strip S and the shank 2a and the body members I and.

2 are then connected to each other by the ordinary pivot l4.

As shown in Fig. 5, when the shears are closed, the two hardened steel strips S interfit snugly.

The ribs of the two strips S are the cutting ribs in the assembled shears. As shown in Figs. 1 and 3, these ribs 5 are preferably concentric with the axis of the pivot I4 so that the curvature of said ribs 5 decreases as they are further away from the pivot N. This applies to ribs 3 of shanks I and la.

As shown in Fig. 5, when a strip S is assembled with its shank 2a, the corrugated strips S intermesh and interfit when the shears are closed. In such case, a raised portion of one strip S interflts with a depressed portion of one strip S. The adjacent ribs of strips s in the shears provided sharp cutting edges.

We have disclosed a preferred embodiment of our invention but numerous changes and omissions can be made without departing from its scope. Thus, members I and 2 may be made of any soft and extrudible metal or alloy which can be shaped under pressure at ordinary room temperature .of 20 C. to 25 C.

Also, shanks Ia and 2a, and strips S may be heated to any suitable temperature, when the assembly is made. The claim for the article is not restricted to any method of manufacture.

We claim:

In a pinking shears, the combination of a longitudinally extending metal cutter strip having transversely corrugated faces and having longitudinally spaced holes extending therethrough and through said faces, and a longitudinally extending metal body member formed separately from the cutter strip and being made of a softer metal than the cutter strip, said body member having a transversely corrugated face which receives one face of the cutter strip, said cutter strip having one of its said faces superimposed thereon with its corrugations in intimate contact with the corrugations on the face of the body member, said body member having longitudinally spaced studs that upstand from its corrugated face and tightly engage in said openings in the cutter strip to maintain said intimate contact between the strip and the body member throughout the length and width of said strip.

EDWARD KANE. EDWIN L. WHI'ILOCK.

References Cited in the file Of this patent UNITED STATES PATENTS Number Name Date 2,177,414 Zeidler Oct, 24, 1939 2,268,626 Sigoda Jan. 6, 1942 2,286,874 Schwartz June 16, 1942 FOREIGN PATENTS Number Country Date 30,130 Austria Oct. 10, 1907 

